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Where did you hear that , no driver currently supports OpenGL 4.0 . GLSL 4.0 not started, GL_ARB_tessellation_shader not started... until those are in the works and then became nearly finished we can't expect OpenGL 4.0 to be soon advertised .

Besides that state, only HD5xxx/HD6xxx hardware supported by r600g driver supports more then OpenGL 3.3 .

no, ofc not but i believe was a low hanging fruit for GCN hardware(aka RadeonSI) and is a lot harder for HD5000+(R600G), so the patches for those cards will come later on. Remeber anything below HD5000 cards only support GL 3.3 so not all card in r600g will support GL 4+

So how is radionsi compared to the mature r600g? Is it recommended I start looking for a GCN card to replace my lowly (and fanless) 6570?

Yea, absolutely. Just avoid the Hawaii parts. Anything in the 265-280x range is really solid. 260x is newer hardware and thus more buggy, usually, but also mostly works. I have a 270x aka 7870 that runs really well.